Malicious PDF — malware analysis report

Static analysis result for SHA-256 b056cce713315b86…

MALICIOUS

PDF

48.2 KB Created: 2021-06-04 02:36:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 2aa866e4ef2024cfa7fa691491ff9d02 SHA-1: e1c019359a13cc358ac72ded301a91e52c879f33 SHA-256: b056cce713315b8683046f352f6c9aa591abcffac03909a53f784b36ae115526
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/431946152/complete-offers-for-robux-game-hack.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.online/app/431946152/complete-offers-for-robux-game-hack PDF link annotation
    • http://perpus.masda.ac.id//repository/rewardex-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-games-with-free-boombox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-robux-without-quizzes_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/daily-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/pokemon-go-no-free-box_GM1094591345.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-2021-spin-link-today_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-generator_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/hack-coin-master-link_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/www-coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-its-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000511b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x511B 27076 bytes
SHA-256: 89677eed11fbcc548a86bd39c5a6f8c5e6e1f1ea2b88b9875f1c1b9d61102593
font_01_sfnt_off00008ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ECC 2832 bytes
SHA-256: 78e89c8f621d90011ffb7a2107d701d4cdf090a2f2cf42d5a65297289afc8805
font_02_sfnt_off0000987d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x987D 18628 bytes
SHA-256: 27a538390e2791e01883ed63320744732627358ab115b0534bac8ed790d0f8b6

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